package com.bite.blog.Utils;

import com.bite.blog.constants.Constant;
import io.jsonwebtoken.*;
import io.jsonwebtoken.io.Decoders;
import io.jsonwebtoken.io.Encoders;
import io.jsonwebtoken.security.Keys;
import lombok.extern.slf4j.Slf4j;

import javax.crypto.SecretKey;
import java.security.Key;
import java.util.Date;
import java.util.HashMap;
import java.util.Map;
@Slf4j
public class JwtUtils {
    private final static long EXPIRATION_DATE = 60*60*1000;
    private final static String secretString ="jkzCeemuvAk0lQG2ImXHbI1Qg/HJbYph7Qa+QIHbDwU=";
    private final static Key key = Keys.hmacShaKeyFor(Decoders.BASE64.decode(secretString));

    public static String genToken(Map<String,Object>claim){
        return   Jwts.builder()
                .setClaims(claim)
                .setExpiration(new Date(System.currentTimeMillis()+EXPIRATION_DATE))
                .signWith(key)
                .compact();
    }

    public static Claims parseToken(String token){
        JwtParser build = Jwts.parserBuilder().setSigningKey(key).build();
        Claims body = null;
        try{
           body = build.parseClaimsJws(token).getBody();
        }catch (ExpiredJwtException e){
            log.error("token过期,token:",token);
        }catch (Exception e){
            log.error("token校验失败,token:",token);
        }
        return body;
    }
    public static boolean checkToken(String token){
        Claims body = parseToken(token);
        if(body==null){
            return false;
        }
        return true;
    }
    public static Integer getUserIdFromToken(String token) {
        Claims body = parseToken(token);
        if (body != null) {
            return(Integer) body.get(Constant.USER_CLAIM_ID);
        }
        return null;
    }
}